Technical data

20
6.5 INDICATOR NEONS
When illuminated, the following conditions apply:-
Warning light (continuously on) - blocked flue or fan fault, contact your Service Engineer.
Overheat thermostat has operated - press white reset button (see Fig. 18) to reset.
Electrical supply to the boiler is on.
Boiler is supplying hot water.
Boiler is supplying central heating.
When the red reset button ( ) is illuminated it indicates that the burner has failed to light - Press the red reset button
(see Fig. 18) and the ignition sequence will restart.
Alpha 500E - Boiler Operation/Routine Servicing
7 ROUTINE SERVICING
To ensure efficient operation of the boiler it is recommended that it is checked and serviced as necessary at regular intervals.
The frequency of servicing will depend upon the particular installation conditions and usage, but in general once per year
should be adequate.
It is the law that any service work must be carried out by a competent person, i.e. CORGI registered personnel.
7.1 IMPORTANT NOTES PRIOR TO SERVICING
1. Check the flue terminal outside and ensure it is not blocked.
2. Run the boiler and check the operation of its controls.
3. Refer to Fig. 2 for location of flue sampling point.
4. Ensure that all system connections and fittings are sound. Remake any joints and check the tightness of any fittings that
may be leaking.
5. It is recommended that the operation of the heating pressure relief valve is checked by turning the head anti-clockwise
until it clicks. The click is the valve lifting off its seat allowing water to escape from the system - check that this is actually
happening.
6. Refill, vent and re-pressurise the system as necessary. (Refer to Commissioning, section 5.1).
7. If the boiler is in a cupboard or compartment, ensure that the ventilation openings are adequate and are clear. (Refer to
General Boiler Information, section 3.3).
8. Record details of the service in the Service History section on page 37 of this manual.
9. Inspect and clean, if required, the filter and cartridge in the pressure reducing valve and cartridge in the expansion relief
valve fitted to the unvented kit.
10. Check the charge in the central heating and domestic hot water expansion vessels and re-pressurise, if necessary.
Warning: Before servicing the boiler, set the selector switch to 0, isolate the electrical supply and close the boiler gas service
cock. Allow the boiler to cool.
The data label is positioned on the left hand case side panel and is visible after removing the front casing.
Always test for gas soundness after servicing any gas carrying components.
7.2 PREPARE FOR SERVICING - Fig. 20
1. Ensure the electrical supply is isolated and the gas supply is off.
2. Remove the two screws securing the top of the front casing. Lift the cover up slightly and remove.
3. Remove the four screws securing the room sealed chamber panel and remove the panel, taking care not to damage the seal.
4. Remove the two fixing screws (one each side) securing the control panel and hinge it forward.
5. Disconnect the electrode leads from the ignition electrodes.
6. Remove the four screws securing the combustion chamber front cover and remove the cover.
7. Disconnect the main burner's union and withdraw the burner out of the boiler. During removal of the burner, disconnect the
flame sensing electrode lead and take care not to damage the side insulation panels.